*Patients with peripheral T cell lymphomas (PTCL) generally have a poor prognosis when treated with conventional chemotherapy. Consolidation with autologous stem cell transplantation (ASCT) has been reported to improve progression-free survival. However, these studies have not compared consolidative ASCT with active observation in patients with PTCL achieving first complete remission (CR1) following induction chemotherapy. We conducted a retrospective analysis of PTCL patients treated at the University of Pennsylvania between 1/1/2007 and 12/31/2014. Patients with cutaneous T cell lymphoma, concurrent B cell lymphomas, and anaplastic lymphoma kinase-positive anaplastic large cell lymphoma (ALK-positive ALCL) were excluded from the study. We compared progression-free survival for patients who underwent ASCT in CR1 following CHOP-like induction regimens and patients who underwent active observation during CR1. 48 patients met all inclusion and exclusion criteria and underwent either active observation (28 patients) or consolidative ASCT (20 patients) in CR1. The 1-year cumulative incidence of relapse in the observation and ASCT groups was 50% (95% confidence interval [CI]: 30-67%) and 46% (95% CI: 23-67%), respectively (P 5 0.55). Median progression-free survival in the observation and ASCT groups was 15.8 and 12.8 months, respectively (log rank, P 5 0.79). Estimated 3-year progression-free survival in the observation and ASCT groups was 37 and 41%, respectively. In conclusion, for PTCL patients achieving CR1 following CHOP-like induction chemotherapy, ASCT does not appear to improve progression-free survival compared to active observation. This finding should be confirmed in a larger, prospective study. Am. J. Hematol. 91:672-676, 2016. V C 2016 Wiley Periodicals, Inc.
IntroductionPeripheral T cell lymphomas (PTCL) are a group of heterogeneous mature T cell neoplasms. For a variety of reasons, prognosis is poor when treated with conventional chemotherapeutic agents. There is currently no consensus on the optimal frontline treatment strategy for PTCL due in part to the lack of data from randomized controlled trials. Based on extrapolated data from studies in aggressive B cell non-Hodgkin lymphomas [1][2][3], the vast majority of patients with PTCL will receive CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone)-like induction chemotherapy. Although complete remission (CR) rates of 50-70% have been reported with CHOP-like chemotherapy [4][5][6][7][8][9], relapse is common. Notably, despite significantly higher rates of initial response, 5-year event-free survival rates as low as 33% have been reported [10].Consolidative autologous stem cell transplantation (ASCT) is frequently offered to PTCL patients in first complete remission (CR1) based on data from prospective studies showing improved overall survival (OS) and progression-free survival (PFS) when compared with historical controls [11,12]. However, since most studies of ASCT in PTCL include patients who achieve a partial response (PR) to standard chem...